Feature: 1. 6Pcs in 1 Set: Comes with 3pcs router collet adapter and 3pcs screw in different sizes to satisfy your varied working needs. 2. Carbon Steel: Adopting premium carbon steel material, all the adapters and screws have high strength and high hardness. 3. Wide Application: Allows for wide application in the collet conversion on trimmer and engraving machine, practical to use. 4. Good Workmanship: Having been through heat treatment and accuracy grinding, these adapters have excellent durability. 5. Simple Carrying: Designed to have a light weight and a compact size, both the carrying and storage are very convenient. Specification: Item Type: Router Collet Adapter Material: Carbon Steel Collet Model and Specification: Specification(Approx.) Upper Outer Diameter(Approx.) Lower Outer Diameter(Approx.) Inner Diameter(Approx.) Height(Approx.) Quantity 6mm / 0.2in 11mm / 0.4in 7mm / 0.28in 6mm / 0.2in 8.4mm / 0.33in 1Pc 6.35mm / 0.25in 11mm / 0.4in 7mm / 0.28in 6.35mm / 0.25in 8.4mm / 0.33in 1Pc8mm / 0.31in 11mm / 0.4in 8.8mm / 0.35in 8mm / 0.31in 7mm / 0.28in 1Pc Nut Model and Specification: Specification Height(Approx.) Aperture(Approx.) Thread Aperture(Approx.) Quantity For 6mm/6.35mm 12mm / 0.5in 7mm / 0.28in 13mm / 0.5in 2Pcs For 8mm 12mm / 0.5in 8.5mm / 0.33in 13mm / 0.5in 1Pc . Package List: 3 x Router Collet Adapter3 x Nut Note: Please match the appropriate size before use.