Check the listing for details. Martin 35BS12HT 3/4 Sprocket. Condition: New – Open box. Listed at 12.00 USD. Martin 35BS12HT 3/4 Sprocket CHAIN PITCH: 3/8 in OUTSIDE DIA. [MIN]: 1 5/8 in LENGTH THROUGH BORE: 3/4 in BORE TYPE: Bored to Size HUB RECESS WIDTH: 0.156 in CALIPER DIAMETER: 1.2489 in HUB OD @ RECESS: 1.072 in CHAIN NO.: 35 FINISHED BORE: 3/4 in NO. OF STRANDS ACROSS: 1 PITCH DIAMETER: 1.449 in SPROCKET STYLE: B KEYWAY SIZE: 3/16 x 3/32 SET SCREW SIZE: 1/4-20 x 1/4 HUB LENGTH THRU: 0.582 in HUB DIA.: 1.2188 in NO. OF TEETH: 12 KEYWAY: Keyway & Set Screw WIDTH ACROSS TEETH: 0.168 in BORE RANGE [MIN]: 3/4 in OUTSIDE DIA.: 1 5/8 in NO. OF SCREWS: 2 HUB RECESS DEPTH: 0.078 in HARDENED TEETH: With Hardened Teeth BORE RANGE [MAX]: 3/4 in MATERIAL: Steel PITCH DIAMETER [MIN]: 1.449 in SINGLE STRAND TOOTH THICKNESS: 0.168 in Listing and template services provided by inkFrog