This bit is designed specifically for use for the karran stainless steel edgesinks for laminate and 1/2" Solid surface materials. They trim The counter-top edge after the bowl is mounted.Trim a sink cutout flush with the bowl in stages using these "over-hang" and flush trim bits in tandem. The overhang bits are equipped with non-marring ultra-glide bearings that are tapered to match the slope of the bowl's side. A first pass with the appropriate overhang bit cleans the cutout edge, leaving a very slight overhang at the underside of the counter. A pass with the flush-trim bit completes the operation, #57155, diameter (D): 49/64, angle (a°): 5°, cutting height (B): 1-1/2, Shank (D): 1/2, overall length (L): 3-D/2, type: 1/8 over hang, replacement bearing: 47733, flutes: 2, a: 1/2 or 3/4, 57155 carbide Tipped sink and trim with ultra-glide ball bearing guide solid surface 49/64 dia x 1-1/2 x 12 Deg x 1/2 inch shank