Feature 1[CLAMPING RANGE] The clamping range of keyless chuck is 1/32in to 1/8in. Confirm whether the size is appropriate before purchase. 2[APPLICABLE FOR] Drill chuck is applicable to all cordless and corded rotary tools for Dremel, including drill bit, grinding wheel, polishing wheel and other light accessories. 3[INTEGRATED STURCTURE] Integrated structure design, made from premium alloy, the chuck is more sturdy and safe than the plastic model, built in spring, stable in performance. 4[HIGH STABILITY] Keyless chuck has high accuracy, can clamp tiny bits more firmly, better align with the rotation of tool, maintain stability under high speed rotation, improve work efficiency. 5[8 SIZES OF COLLETS] The brass collet has 8 sizes for you to choose: 0.8mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.4mm, 3.0mm, 3.2mm. Please confirm the size before purchase. Item Type: Drill Chuck Collet SetMaterial: Metal, BrassKeyless Drill Chuck Clamping Range: Approx. 0.8-3.2mm / 1/32-1/8inBrass Collet Clamping Size: Approx. 0.8mm/0.03in 1.2mm/0.05in 1.5mm/0.06in 1.8mm/0.07in 2.0mm/0.08in 2.4mm/0.09in 3.0mm/0.12in 3.2mm/0.13in Package List 1 x Drill Chuck8 x Brass Collet1 x Metal Replacement Collet NutNoteCompatible for Dremel all rotation tools and for Dremel flexible axes. Except for discontinued models 1, 2 and series 1 or earlier versions of discontinued models 260, 270 and 280.