Carbon motor brush, fitness:miter saw,chop saw,drill, hammer drill,dust collector,blower motor,motorcycle,weed whacker,cut-off saw Carbon Brush Size (Approx.): 12mm x 9mm x 6mm(L*W*H),Total Length: 29mm(1.14') Net Weight: 4g; Material: Carbon, Metal; Main Color: Gray, Gold Tone This size can be made to fit most tools with replaceable brushes. Set includes 2 brushes,Replace brushes every 60 hours