Wiha Set of 100 Square Contractor Bits, 1 x 50mm - WI 72285Wiha Set of 100 Square Contractor Bits, 1 x 50mm WI 72285 The Square Contractor Bits are engineered for high torque applications in woodworking, construction, and general fastening tasks. Designed with a square (Robertson) drive profile, these bits provide an exceptionally secure fit that minimizes cam out, slippage, and wear making them ideal for demanding professional and industrial use. Specifications: Height: 4. 10 in Length: 5. 60 in Width: 4. 10