The spindle is 2-1/4-8 TPI
4971" 1011-5834 5/8" 3/4" 1-3/4" 4" 0
The anvil and spindle are both hardened and ground
Auto identification of Impact Device
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1011-0008, 8 PS/Set HSS Corner Rounding End Mills, Size from 1/16" to 3/8" On Sale The spindle is 2-1/4-8 TPI8 PS Set HSS Corner Rounding End Mills, #1011 0008 Applications Intended for use in milling rounded corners Form relieved type; can be sharpened repeatedly without changing the form. Right hand cut. Formed radius cutter. Suitable for a wide range of ferrous and nonferrous materials Set includes 1011 0116, 1011 0332, 1011 0018, 1011 0532, 1011 0312, 1011 1412, 1011 0512 and 1011 3878 1 16", 3 32" with 3 8" shank 1 8", 5 32", 3 16", 1 4", 5 16", & 3 8"