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 5.4in ModelOutside Diameter Approx.Inside Diameter Approx. ER16-117mm / 0.7in1mm / 0.04in ER16-217mm / 0.7in2mm / 0.08in ER16-317mm / 0.7in3mm / 0.12in ER16-417mm / 0.7in4mm / 0.16in ER16-517mm / 0.7in5mm / 0.2in ER16-617mm / 0.7in6mm / 0.24in ER16-717mm / 0.7in7mm / 0.28in ER16-817mm / 0.7in8mm / 0.31in ER16-917mm / 0.7in9mm / 0.35in ER16-1017mm / 0.7in10mm / 0.39in 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 110Pcs in 1 Set: The kit contains 10pcs ER16 spring collets of different models, suitable for different processing scenarios. 2Durable Material: These collets are made of excellent high speed steel material (HSS) and have good rust and corrosion resistance. 3With Wrench: Equipped with a suitable wrench, it is easy to use and adjust the collet, no other tools are needed. 4Multiple Usages: Used in various machining applications, including boring, milling, reaming, tapping and grinding, etc. 5Convenient Storage: These spring collets are stored in a plastic box, which is small and portable, easy to store and carry.