Brewer D50B17F Idler Sprocket — B-Style Needle BearingBrewer D50B17F b style needle bearing from the Brewer Idler Sprockets catalog. Manufactured in St. Louis, MO. Sold by Texas Belting & Supply, an authorized Brewer distributor. Authorized Brewer distributor Same day shipping from Houston Need application help or want to verify compatibility? Call 888 203 2358 you'll talk to a real person who knows tensioners. Specifications A. S. A. Chain No. D50 No. Teeth 17 Width Strand Chain 2 Dimension A 3. 719