A surgical drill bit, comprising: a mounting portion extending from a first end to a second end, the mounting portion configured to mount to a tool; and a working portion adjacent the first end of the mounting portion, the working portion configured for cutting a hole in a bone, the working portion including: a body portion extending from a distal end to a proximal end, the body portion including a top surface and a side surface; a blocking portion formed at the proximal end of the body portion and having a first diameter greater than a maximum diameter of the body portion; at least one channel formed in a longitudinal direction of the working portion, the at least one channel extending from the top surface through the blocking portion, wherein the at least one channel defines, along the body portion, a cutting blade portion (30, 30A, 30B, 30C) configured to cut the bone upon rotation of the surgical drill bit, the cutting blade portion (30, 30A, 30B, 30C) including: a first top cutting surface (30A-1) having a first angle relative to a longitudinal axis of the body portion; and a second top cutting surface (30A-2) having a second angle relative to the longitudinal axis, characterized in that the second angle is smaller than the first angle. a mounting portion extending from a first end to a second end, the mounting portion configured to mount to a tool; and a working portion adjacent the first end of the mounting portion, the working portion configured for cutting a hole in a bone, the working portion including: a body portion extending from a distal end to a proximal end, the body portion including a top surface and a side surface; a blocking portion formed at the proximal end of the body portion and having a first diameter greater than a maximum diameter of the body portion; at least one channel formed in a longitudinal direction of the working portion, the at least one channel extending from the top surface through the blocking portion, wherein the at least one channel defines, along the body portion, a cutting blade portion (30, 30A, 30B, 30C) configured to cut the bone upon rotation of the surgical drill bit, the cutting blade portion (30, 30A, 30B, 30C) including: a first top cutting surface (30A-1) having a first angle relative to a longitudinal axis of the body portion; and a second top cutting surface (30A-2) having a second angle relative to the longitudinal axis, a body portion extending from a distal end to a proximal end, the body portion including a top surface and a side surface; a blocking portion formed at the proximal end of the body portion and having a first diameter greater than a maximum diameter of the body portion; at least one channel formed in a longitudinal direction of the working portion, the at least one channel extending from the top surface through the blocking portion, wherein the at least one channel defines, along the body portion, a cutting blade portion (30, 30A, 30B, 30C) configured to cut the bone upon rotation of the surgical drill bit, the cutting blade portion (30, 30A, 30B, 30C) including: a first top cutting surface (30A-1) having a first angle relative to a longitudinal axis of the body portion; and a second top cutting surface (30A-2) having a second angle relative to the a first top cutting surface (30A-1) having a first angle relative to a longitudinal axis of the body portion; and a second top cutting surface (30A-2) having a second angle relative to the longitudinal axis, characterized in that the second angle is smaller than the first angle.