Relton PC-20 Specifications: Finish Hole Diameter: 1-1/4" Weight: 1.3 lbs.Relton PC-20 Includes: (1) Porcelain Cutter 1-1/4" Finish Hole Diameter Relton PC-20 Features: For Installing: Reverse Osmosis Systems Hot-Water Dispensers Spa Jets in pre-existing bathtubs Drill through porcelain and cast iron with pilot bit. Drill through porcelain only with spring-loaded saw. Drill through cast iron with finish saw. Relton Porcelain Cutter Kits are designed with the Finish Saw 1/8" smaller in diameter than the Porcelain Saw. The Finish Saw diameter is usedto determine which kit should be purchased. Note: Kits are designed for porcelain over cast iron, NOT for solid Porcelain.