Engineered to work with T-Type and Non T-Type 10-12sp chains Precision CNC-machined in the UK from aerospace 7075-T6 aluminum Compatible with SRAM direct mount 3-bolt crank arms TECH SPECS table{border-collapse:collapse;width:100%;} td{text-align:left;padding:8px;font-weight:350;} tr:nth-child(even){background-color:#f2f2f2} th{background-color:#eb212e;color:white;text-align:left;padding:8px;} .desc .specs-heading{font-size:24px;font-weight:600;padding-top:35px;border-top:3px solid #f0f0f0;display:inline-block;border-bottom:4px solid #eb212e;width:142px;margin:0;} Model Round SRAM 3-Bolt DM Ring Type Single (Anti-Chain Drop) Mount 3-Bolt DM 6mm Offset Teeth 38 Oval/Round Round Color Black