TIR = 0.0005 Internal / external threads. Collet Block Chuck for 5C Round, Hex or Square Collets(CS-5PCS) Each block weighs 1 lb. And dimensions area approximately 1-3/4" x 1-3/4" x 2-3/4" long Capacity:1/16" thru 1-1/8" Made of high quality tool steel, hardened Precision ground, ground, parallel and square to within 0.0005" Set consisting of 1 square, 1 hex, and 1 collet closer. Orders over a certain dollar amount will be insured and sent signature required.CANCELLATION NOTICE: Please be sure your address is correct before placing your order! The item "HFS(R) 14 Pcs 1/8-1x16ths 5C Precision Round Collets withCollet Block Chuck" is in sale since Sunday, January 6, 2019. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Collet Chucks". The seller is "pacificsale" and is located in Covina, California. This item can be shipped to United States, Canada, Mexico.