• Grinding Wheel,Depressed Center Wheels • Let us exceed your expectations with the extended life of this BlueFire ZA ZA Type 27 grinding wheel. Its advanced zirconia-alumina/premium aluminum oxide grit produces a tough face that can last up to two or three times the working life of pure aluminum oxide wheels. This wheel’s 0.25-inch central depression gives it just the right shape for a convenient 30-degree angle grind for light-to-heavy duty jobs. Useful across a range of applications, this versatile grinding wheel for your right angle grinder is ideal for working with hard and soft steel alloys, including the 400-series and hard carbon steel mixes. • A blend of the most advanced zirconia alumina and premium aluminum oxide abrasives delivers 2 to 3 times the life of aluminum oxide wheels • 1/4 inch thick depressed center wheel designed to be used at a 30 degree angle on a right angle grinder for light- to heavy-duty grinding on the bottom/face of the wheel • Broad utility; from light-to heavy-pressure applications • Excellent blend of performance and price on a wide range of materials, including 400 series stainless, hard carbon steels, and soft carbon steels • All wheels are fully speed tested and comply with ANSI standards