102 XL 031 Ametric&reg; Imperial Pitch Neoprene Timing Belt, XL Tooth Profile, 0.2 inch Pitch, 10.2 inch Long, 0.3125 inch Wide, 51 Teeth, 0.05 inch Depth of Tooth, 0.053 inch Tooth Face Length, 0.09 inch Belt Thinkness (Mfg Code 1-091)