Syntec 4" Turbo Cup Wheel 25 30 Grit with Threaded Arbor Collated Self Drilling Screws This conduit clamp is for This conduit clamp is for high volume applications and works with gas actuated concrete nailer tools as well as with common powder actuated tools for fastening into harder substrates (structural steel or extra hard concrete) when required Use recommended driving speed and method for self drilling screws to ensure efficient and accurate installation The Turbo Semented Cup design allows for constant contact between the segments and the masonry to produce an aggressive cut Syntec Turbo Cup wheels are among the highest in quality in the surface grinding polishing industry