Product Description The is suitable for older Shimano Trekking groupsets and comes with a 13.5 mm metal threaded piece. Specifications:Application:City, City & TouringMount:13.5 mm threaded boltCapacity:44 tooth, 48 toothTechnical Information:Material:compositeFeatures:for Shimano cranks and bottom brackets as of 1992made of sturdy plasticmetal threaded bolt standard 13.5 mm included Note from the manufacturer:After removing the bottom bracket plastic cap, put on the Hebie chain guard and screw in the Hebie threaded bolt.Models:44 tooth: Type:324Outer Diameter:19 cmCompatibility:Shimano cranks as of 1992 and before 2003 (Deore XT, Deore LX, STX, Alivio, Acera, CX groupsets)Manufacturer Number:0324 E5 48 tooth: Type:323Outer Diameter:21 cmCompatibility:Shimano cranks as of 1993 and before 2003 (Deore DX, Deore LX, Exage, Altus groupsets)Manufacturer Number:0323 E5Contents:1 x Hebie Chainring chain guard, 323 or 3241 x Hebie threaded piece 13.5 mm Manufacturer: tubus carrier systems GmbH Virnkamp 24 48157 Münster Germany contact@hebie-group.com