High performance bottom bracket Machined from 6061-T6 aluminum with anodized black finish Premium 440C stainless steel bearings For installation/removal of notched cup BBs, use 12-notch for 46mm outside diameter BB tool, PK5832 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 Hellbender 70 Spindle Interface 24mm Shell BSA Shell ID 33.6mmx24tpi Width 68/73mm Color Gold