Made of alloy steel and hardened to HRC 60-62. 11Pcs collects, one 3MT collets holder, and one wrench are included in the package. Taper: Morse Taper 3, MT3. 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 1/2.Back Bar Thread :M12 x 1.75P. All of our products are 100% inspected. All of our products are in brand new condition. If you have any questions regarding our products or services, please give us a chance for correction. Please do not leave a negative or neutral feedback. We will do our best to fix it. The item "ZLIVECENTER MT3 ER20 COLLET CHUCK TOOL HOLD SET 11 PCs 3MT ER 20 TOOL HOLDER" is in sale since Sunday, October 4, 2015. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Workholding\Collet Chucks". The seller is "zlivecenter" and is located in Diamond Bar, California. This item can be shipped worldwide.