Cnc extender adapter made especially for 1/2" Shank router bits., #47641, (D) diameter 1, (D) shank 1/2, overall length (L) 3-5/8, max RPM 18, 000, L1 1-25/32, L2 1-9/16, L3 13/32, D1 1/2, 47641 1/2 inch Shank CNC extension adapter for 1/2 inch Shank router bits