CRL 4-1/2" Suction Base Drilling Round Ring Glass Abrasive Tools and its color is stable

and its color is stable to ultraviolet exposure

Easy to operate

the CRL Listo® Mechanical Pencil is a great choice

allowing oil to flow to the cutting wheel

There should be no metal or wood to glass contact

CRL 4-1/2" Suction Base Drilling Round Ring Glass Abrasive Tools and its color is stableInstantly Creates a Coolant Dam Slanted Walls Helps Stop Splashing Cleans Easily Won't Rust! Use our CRL Suction Base Drilling Rings for drilling glass whenever you use coolant or carbide grain. Made of a special rubber compound that wont break the glass if accidentally dropped on it. Easy to use, just wet the base with coolant or glass cleaner and press onto the glass. Four sizes of round rings, plus an oval shaped ring for drilling dual outlets.