GB standard long-life precision drill sleeve drill bit sets

GB standard long-life precision drill sleeve drill bit sets the national standard drill sleeve, high precision, long hole guide, to ensure the accuracy of the drilling position and holes. And lower prices, better quality, long life and is more resistant. Fixed drill bushing GB GB / T 8045.1-1999 (Part common specifications fixed drill sets in stock, please consult) Exchangeable drill bushing GB GB / T 8045.2-1999 drill sleeve bushing GB GB / T 8045.4-1999 Also available in various non- standard drill sleeve, fixed drill sets, interchangeable drilling units, alloy drill sleeve, tungsten steel drill sleeve, adjustable sets, Morse taper drill sleeve sets and other processing