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Specification: Type: R8 Collet Including size: 1/8" 3/16" 1/4" 5/16" 3/8" 7/16" 1/2" 9/16" 5/8" 11/16" 3/4" 13/16" 7/8" Material: Spring steel Threaded internally: 7/16"-20 Precision: 0.015mm Guaranteed T.I.R.: 0.0006" Quantity: 13 pieces 13 Piece set includes 1/8" - 7/8" collets Feature: 1. High-quality steel: Spring steel has excellent comprehensive performance, excellent metallurgical quality, good surface quality, precise shape and size. 2, the overall full grinding: R8 chuck, the overall refined full grinding, full grinding manufacturing, the overall surface is smooth, low resistance, after heat treatment, full grinding processing, high hardness and high precision, small beating. 3, positioning groove: R8 chuck has a positioning groove on one side, the installation is faster and more convenient. 4. Male and female threaded holes: The R8 chuck has threaded holes for quick connection with the pull rod. The threaded holes are made of both teeth and inch teeth.