Patent ID: 7334506

Claim:
A socket having two inner holes with different size recessed in opposite end portions of the socket, having an intermediate driving polygonal hole formed in a middle section in the socket between the two inner holes; said socket comprising a first inner lining formed in a first inner hole recessed in a left side portion of the socket, having a first torque recess recessed in the first inner lining, and including a first-sized hexagonal hole defining a first-sized diagonal distance (D 1 ) between two diagonal points of the first-sized hexagonal hole, and a second-sized hexagonal hole gradationally contracted inwardly from the first-sized hexagonal hole and defining a second-sized diagonal distance (D 2 ) between two diagonal points of the second-sized hexagonal hole, with the second-sized diagonal distance (D 2 ) being smaller than the first-sized diagonal distance (D 1 ), so that the first inner lining as formed in a left side of the socket is selectively engaged with two nuts or bolts as first-sized and second-sized; and a second inner lining formed in a second inner hole recessed in a right side portion of the socket, having a second torque recess, smaller than the first torque recess, recessed in the second inner lining, and including a third-sized hexagonal hole smaller than the second-sized hexagonal hole and defining a third-sized diagonal distance (D 3 ) between two diagonal points of the third-sized hexagonal hole, and a fourth-sized hexagonal hole gradationally contracted inwardly from the third-sized hexagonal hole and defining a fourth-sized diagonal distance (D 4 ) between two diagonal points of the fourth-sized hexagonal hole, with the fourth-sized diagonal distance (D 4 ) being smaller than the third-sized diagonal distance (D 3 ), so that the second inner lining as formed in the right side of the socket is selectively engaged with further two nuts or bolts as third-sized and fourth-sized.