A drill bit comprising: a shank having a rear end configured to be coupled to a rotary power tool; an intermediate shaft defining a longitudinal axis and having a rear end coupled to a front end of the shank and at least one spiral flute; and a cutting head having: a body having a rear end coupled to a front end of the intermediate shaft, a front end, and a peripheral sidewall: a primary cutting insert coupled to a front end of the body, the primary cutting insert having a cross-shape with a central portion, and first, second, third, and fourth cutting arms (54A, 54B, 54C, 54D) extending radially outward from the central portion characterised in that the cutting head further comprises; a pair of auxiliary cutting inserts coupled to the front end, each of the auxiliary cutting inserts spaced radially outward from the central portion and spaced circumferentially from each of the radial cutting arms, a first one of the auxiliary cutting inserts positioned between the first cutting arm and the second cutting arm and a second one of the auxiliary cutting inserts positioned between the third cutting arm and the fourth cutting arm; a pair of primary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the primary dust egress slots positioned between the second and third cutting arms (54B, 54C), and a second of the primary dust egress slots positioned between the first and fourth cutting arms (54A, 54D); and a pair of auxiliary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the auxiliary dust egress slots positioned between the first and second cutting arms (54A, 54B), and a second of the auxiliary dust egress slots positioned between the third and fourth cutting arms (54C, 54D). a shank having a rear end configured to be coupled to a rotary power tool; an intermediate shaft defining a longitudinal axis and having a rear end coupled to a front end of the shank and at least one spiral flute; and a cutting head having: a body having a rear end coupled to a front end of the intermediate shaft, a front end, and a peripheral sidewall: a primary cutting insert coupled to a front end of the body, the primary cutting insert having a cross-shape with a central portion, and first, second, third, and fourth cutting arms (54A, 54B, 54C, 54D) extending radially outward from the central portion characterised in that the cutting head further comprises; a pair of auxiliary cutting inserts coupled to the front end, each of the auxiliary cutting inserts spaced radially outward from the central portion and spaced circumferentially from each of the radial cutting arms, a first one of the auxiliary cutting inserts positioned between the first cutting arm and the second cutting arm and a second one of the auxiliary cutting inserts positioned between the third cutting arm and the fourth cutting arm; a pair of primary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the primary dust egress slots positioned between the second and third cutting arms (54B, 54C), and a second of the primary dust egress slots positioned between the first and fourth cutting arms (54A, 54D); and a pair of auxiliary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the auxiliary dust egress slots positioned between the first and second cutting arms (54A, 54B), and a second of the auxiliary dust egress slots positioned between the third and fourth cutting arms (54C, 54D). a primary cutting insert coupled to a front end of the body, the primary cutting insert having a cross-shape with a central portion, and first, second, third, and fourth cutting arms (54A, 54B, 54C, 54D) extending radially outward from the central portion characterised in that the cutting head further comprises; a pair of auxiliary cutting inserts coupled to the front end, each of the auxiliary cutting inserts spaced radially outward from the central portion and spaced circumferentially from each of the radial cutting arms, a first one of the auxiliary cutting inserts positioned between the first cutting arm and the second cutting arm and a second one of the auxiliary cutting inserts positioned between the third cutting arm and the fourth cutting arm; a pair of primary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the primary dust egress slots positioned between the second and third cutting arms (54B, 54C), and a second of the primary dust egress slots positioned between the first and fourth cutting arms (54A, 54D); and a pair of auxiliary dust egress slots formed in the peripheral sidewall of the body and extending from the front end of the body to the rear end of the body, a first of the auxiliary dust egress slots positioned between the first and second cutting arms (54A, 54B), and a second of the auxiliary dust egress slots positioned between the third and fourth cutting arms (54C, 54D).