PREMIUM LASER-WELDED SEGMENTS - Premium, long lasting, and durable diamond segments are laser-welded for added strength. WET OR DRY - Use dry or wet on cured concrete, masonry, brick, block, roofing tile, stone, pavers, slate, terrazzo, and similar materials. HEAVY DUTY GENERAL PURPOSE - Great for harder materials or when you want a blade that lasts. Mad Dog HS Premium blades last longer and cut faster than standard blades. SPECIFICATIONS - 4" diameter X .080 thick with a 7/8" arbor hole. Preinstalled 5/8" bushing for adapting to just about any hand-held angle grinder or trim saw. The maximum safe operating speed is 15,200 RPM. LIFETIME WARRANTY - All Delta Diamond Products, Inc Diamond Blades, Coring Bits, Hole Saws and Grinding Wheels include a lifetime warranty against warping, cracking, and material defects. If any diamond tool (being used under its intended use with at least 50% wear left) fails to cut or work properly, or if the bond between the diamond segment and the steel core becomes separated at any time, the diamond tool will be replaced. Delta Diamond Mad Dog HS 4 Inch Segmented Diamond Blade, .080 X 7/8"-5/8" Arbor, Premium, Wet/Dry, Laser-Welded, General Purpose Cutting Concrete, Masonry, Stone (4") PREMIUM LASER-WELDED SEGMENTS - Premium, long lasting, and durable diamond segments are laser-welded for added strength. WET OR DRY - Use dry or wet on cured concrete, masonry, brick, block, roofing tile, stone, pavers, slate, terrazzo, and similar materials. HEAVY DUTY GENERAL PURPOSE - Great for harder materials or when you want a blade that lasts. Mad Dog HS Premium blades last longer and cut faster than standard blades. SPECIFICATIONS - 4" diameter X .080 thick with a 7/8" arbor hole. Preinstalled 5/8" bushing for adapting to just about any hand-held angle grinder or trim saw. The maximum safe operating speed is 15,200 RPM. LIFETIME WARRANTY - All Delta Diamond Products, Inc Diamond Blades, Coring Bits, Hole Saws and Grinding Wheels include a lifetime warranty against warping, cracking, and material defects. If any diamond tool (being used under its intended use with at least 50% wear left) fails to cut or work properly, or if the bond between the diamond segment and the steel core becomes separated at any time, the diamond tool will be replaced.