| 摘要 |
A two-ended screwdriver bit (10) sized and configured to fit and lock in chucks (100) that accept bits complying with American National Standards Institute specification ANSI B107.4-1982 for 1/4 inch hexagonal bits. The two-ended bit (10) has a hexagonal shank (12) with two circumferentially-extending grooves (16, 18) in the screwdriver tip at each end of the shank (12). The length from the midpoint of each groove (16, 18) to the end of its adjacent screwdriver is 3/8 inches, permitting either end of the bit to be seated in a standard chuck (100). |
