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, 2mm, 5mm, 8mm, 0mm, 4mm, 0mm, 2mm. Please confirm the size before purchase.