Features 10Pcs in 1 Set: The kit contains 10pcs ER16 spring collets of different models, suitable for different processing scenarios. Durable Material: These collets are made of excellent high speed steel material (HSS) and have good rust and corrosion resistance. With Wrench: Equipped with a suitable wrench, it is easy to use and adjust the collet, no other tools are needed. Multiple Usages: Used in various machining applications, including boring, milling, reaming, tapping and grinding, etc. Convenient Storage: These spring collets are stored in a plastic box, which is small and portable, easy to store and carry. Specification:Item Type: Collet Chuck Set Product Material: High speed steel Collet Model: ER16-1, ER16-2, ER16-3, ER16-4, ER16-5, ER16-6, ER16-7, ER16-8, ER16-9, ER16-10 Product Model: SKER1610PC03 Wrench Size: Approx. 8 x 30 x 138mm / 0.3 x 1.2 x 5.4inModelOutside Diameter Approx.Inside Diameter Approx.ER16-117mm / 0.7in1mm / 0.04inER16-217mm / 0.7in2mm / 0.08inER16-317mm / 0.7in3mm / 0.12inER16-417mm / 0.7in4mm / 0.16inER16-517mm / 0.7in5mm / 0.2inER16-617mm / 0.7in6mm / 0.24inER16-717mm / 0.7in7mm / 0.28inER16-817mm / 0.7in8mm / 0.31inER16-917mm / 0.7in9mm / 0.35inER16-1017mm / 0.7in10mm / 0.39in Package List:1 x ER16-1 Collet1 x ER16-2 Collet1 x ER16-3 Collet1 x ER16-4 Collet1 x ER16-5 Collet1 x ER16-6 Collet1 x ER16-7 Collet1 x ER16-8 Collet1 x ER16-9 Collet1 x ER16-10 Collet1 x Wrench Package List 1 x ER16-1 Collet 1 x ER16-2 Collet 1 x ER16-3 Collet 1 x ER16-4 Collet 1 x ER16-5 Collet 1 x ER16-6 Collet 1 x ER16-7 Collet 1 x ER16-8 Collet 1 x ER16-9 Collet 1 x ER16-10 Collet 1 x Wrench