Profile: Classic Engineering is engaged in providing boring jig kits and related accessories. We offer boring jig kit with basic fixture for standard 2-3/8" & 2-3/4" backset positioning, 1" spade boring bit, 2-1/8" spur bit, 1-1/2" spur bit, 3/8" quick release adapter and 1-1/2" reducer ring. We render adapters, carbide spur bits, multi-spur bits, spade bits and jig fixtures.