... high quality fiber glass nets. grinding wheel,T27 and T42 depressed center wheelsFeatures: high strength,durability,high efficiency and safety,etc ... steel, C and GC for glass,stone and etc. T27 Depressed Center Wheel 100 x 6 x 16mm4" x 1/4 ... x 22mm9" x 1/4" x 7/8"50pcs/ctnT42 Depressed Center Wheel 100 x 3 x 16mm4" x 1/8 ... stainless steel, C and GC for glass,stone and etc. Depressed Center Grinding Wheel