ITEM NAME:8Pcs 1.5-8mm Hex Key Allen Bit Quick Change Connect Impact Driver Screwdriver # Description Specification: Brand new Material: S2 Length: approx. 50mm/2" Size: 1.5mm (H1.5), 2mm (H2), 2.5mm (H2.5), 3mm (H3), 4mm (H4), 5mm (H5), 6mm (H6), 8mm (H8) Feature: 1/4" quick connect hex shank. High strength and hardness. Easy to use. Durable in use. For impact drivers & drills etc. Also compatible with corded drills, cordless drills, electric screwdrivers etc. Fit most SAE (American) size Hex Screws & Bolts. Package included: 8pcs x Hex Key Bits Note: Please allow 1-5mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same..8pcs x Hex Key Bits. Size: 1.5mm (H1.5), 2mm (H2), 2.5mm (H2.5), 3mm (H3), 4mm (H4), 5mm (H5), 6mm (H6), 8mm (H8). For impact drivers & drills etc. Easy to use. Durable in use.