This package includes one suction base and four drill guide rings in an aluminum carry box. The four size guides are 1", 1-1/4", 1-3/8" and 1-1/2". The drill guide ring will keeps the core bit in correct position and prevents the core bit jumping or skipping on your work piece. The most cost effective way to produces clean and accurate holes with ease every time on any granite, marble or tiles. Four Gilatools premium wet stone core bits - You'll get one of each size of 1", 1-1/4", 1-3/8" and 1-1/2" stone core bit. The core bit has 4" tube with individual segment height of 8mm. Specially formulated premium quality segments provide smooth and clean cutting in granite, marble, stone, tile, porcelain and similar materials. Use on core drilling machines, hand-held drills or angle grinder. For wet drilling only. Also one 3/8" Tri-Hex Shank Adapter - It converts the 5/8"-11 male thread to 3/8" shank for use on electric hand drill.
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