Check the listing for details. 4 Size 3/8" 1/2" 5/8" 3/4" Drill Chuck Key Combination Wrench Drill Press Chuck. Condition: New. Listed at 10.33 USD. Features: Drill chuck wrench for electric drill clamping tool. Use for controlling tightness of looseness of electric drill clamping tool. Can be used in hammer or drilling mode,very durable, comfortable to grip. Note: Do not subject chuck key handles to hammer or other impact blows. As long as the dimensions are right, you don't need to use too much force to tighten the drill chuck. Otherwise, the gear may be damaged. Specifications: Item color: black Chuck Diameter Teeth Quantity Outer Diameter of Gear Salient Point Net Weight 001 20mm 11pcs 25mm 9mm approx 111g 002 10mm 11pcs 12.5mm 6mm approx 21g 003 13mm 12pcs 17.5mm 6mm approx 34g 004 16mm 11pcs 21.5mm 8mm approx 63g Package Included: 4x Drill Chuck Key