Universal Drive hex for easy access to electric screwdrivers. Quickly convert any 1/4 inch cordless electric screwdriver into a drill or grinder. One-handed operation ensures smooth and efficient performance. 1/4 inch hex - universal drive for compatibility with most electric screwdrivers. Chuck accommodates drill bits from 0.3mm to 6.5mm, suitable for a wide range of drilling tasks. Color: Silver + Black. Material: Aluminum alloy + carbon steel. Size: 90mm length hexagonal handle drill chuck, clamping range: 0.3mm - 6.5mm with 1/4 inch (6.35mm). 57mm length hexagonal handle drill chuck, clamping range: 0.3mm - 3.6mm with 1/4 inch (6.35mm). 61mm length round handle drill chuck, clamping range: 0.3mm - 3.4mm with 1/8 inch (3mm). 59mm length round handle drill chuck, clamping range: 0.3mm - 3.4mm with 1/16 inch (2.35mm). Package Contents: 4 x Drill Chuck Quick Change Adapter. Only the above package content included; other items not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3cm.