You are Buying a Brand New And Factory Sealed Avanti Pro 4-1/2 in. x 1/16 in. x 7/8 in. Thin Kerf Masonry Cutting Disc.... designed for smoothing and blending concrete and masonry materials. This grinding wheel is for a right-angle grinder and is designed for masonry cutting. This universal 4-1/2 in. masonry cutting disc can be used with all 4-1/2 angle grinders.