Specification:Product Name : Drill ChuckThread Mount: 3/8inch-24UNFCapacity: 0.8mm-10mmDrill Chuck Overall Size: 60 x 41mm/2.36 x 1.61inch(L*D)Adapter Total Size : 52 x 14mm/2.05 x 0.55inch(L*D)Adapter Shank Size : 6.3 x 27mm/0.25 x 1.06inch(D*L)Adapter Material : 40crShank Type : Hex Shank Package Content :1 x Drill Chuck1 x Drill Chuck Adapter Description:1.3/8in Drill Chuck Key-Less - No Chuck Key Needed - Hold and Turn to Tighten or Loosen Chuck.2.Fits Many Drill Models and Brands with 3/8inch-24UNF Thread Shaft/Spinal Chuck Mount.3.Chuck can tighten on drill bits from 0.8mm-10mm.4.Excellent replacement or upgrade for thousands of model corded and cordless drills.