8pc Diamond Core Drill Set with 1/8″ Shaft: Diameters in Set; 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm & 10mm. High Quality Nickel Plated Diamond on Steel Blanks.
Cautions: Maximum Speed Rating: 1500rpm. Always wear safety goggles. Always wear an appropriate mask so you do not breath in particulates and harmful vapors. Always wear hand and body protection. Failure to adhere to these cautions can result in serious injury or death.