Mastercut SL-1FM 1/4" X 5/8" Radius Cone Shape Alumacut Carbide Burr Part Number: SL-1FMSKU: MTOSL-1FM $19.44 Clear Options Qty: Add to Cart Order In Bulk Add $250.00 worth of items to your cart to qualify for free shipping. Item Details Mastercut Aluminum Radius Cone Burr with a cutting length of 5/8" and overall length of 2" has a cutting diameter of 1/4" and has a 1/4" shank.