These Snap Bushings for Thicker Panels convert raw-edged holes to smooth, neat, insulated holes in 1/4" (6.40mm) thick panels. They insulate and mechanically protect electrical and telecommunications cables, tubing, hose, rope, and utility lines. These bushings are available in 10 sizes for use in 1/2" - 2" (12.70mm - 50.80mm) diameter holes.