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The popular Keller templates require the use of bits with shank-mounted pilot bearings. This bit is specifically designed for use in the Keller system. Maximum RPM 18, 000, #45469, diameter (D): 0.615, cutting height (B): 1/2, shank (D): 1 /4, overall length (L): 2-1/4, Type: Straight, replacement bearing: 47712, Keller number: 1641/1541 flutes: 2 45469 carbide Tipped straight plunge .615 DIA x 1/2 x 1/4 inch shank with upper Bb