C52 Segmented or Double Pointed Solid Back Core Bits Size: 3" Double-Pointed Segmented, quality. Level 5 - Hard Aggregate & Heavy Steel: Size: 3". Spec: C52. Faster drilling - The new double-pointed segments provide incredibly fast drilling speeds. Fast seating and reduced vibration it penetrate quickly, and hold a straight drilling path. Improved cooling and slurry removal it increases water flow to reduce heat and removed slurry. Specially formulated segments - Pro V bits contain high concentrations of quality diamonds.