CRL Glass Drilling Base with Keyless Chuck Prismatic & Spearpoint Glass Drill Bits The cast iron rings have

The cast iron rings have rubber bases to hold them securely to the glass

use spacer shims at quarter points to maintain 1/8" minimum bedding thickness

ground fault interrupt circuit

Economical

Apply firm pressure along the entire length to ensure a continuous seal

CRL Glass Drilling Base with Keyless Chuck Prismatic & Spearpoint Glass Drill Bits The cast iron rings haveField Fabricate Non Tempered Glass and Mirror Adjustable Stop and Spring Resistance Ensure Safe and Clean Drilling Base Gasket Holds the Base in Place While Keeping the Coolant Coralled Lightweight and Durable Enough to Withstand the Daily Installation Abuses Available with Either a Keyless or Belgium Chuck Use With Drills Up to 4 1 2" (114 mm) Diameter With this CRL Glass Drilling Base, field glass drilling nightmares are a thing of the past. Ever