CRL 3" Suction Base Drilling Round Ring Backer Rods & Insert Tools They are fireproof in accordance

They are fireproof in accordance with regulations and building codes

Very commonly used when scraping walls

There are two sizes available

120º Hone Angle

CRL 3" Suction Base Drilling Round Ring Backer Rods & Insert Tools They are fireproof in accordanceInstantly 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 won't 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.