Heavy-Duty Drywall Circle Cutter Tungsten Carbide Blade - Cut Holes 1" to 16" Professional's choice for making clean, neat holes in drywall, laminates, paperboard Slide pivot point on steel frame to desired diameter and lock in place with tension knob All metal construction with hardened steel pivot tip and durable tungsten carbide wheel-blade Frame gauge with markings from 1" to 16" by 1/8" allow quick adjustment for accurate cuts Great for plumbing, electrical, HVAC installation, architectural effects & more