- Material: 7075 aluminum alloy and plastic for a strong, lightweight chain guide body. - ISCG-03 compatibility: fits ISCG-03 standard with mounting hole spacing of 47.7 mm. - Chainring compatibility: round rings 30T to 40T; oval rings 30T to 38T. - Includes: installation instructions for the chain guide. - Use case fits: designed for mountain bikes using ISCG-03 mounts, suitable for rugged terrain where chain retention is important, and compatible with common 30-40T chainrings (round or oval 30-38T) for versatile setup. - Practical applications: 1) Downhill and all-mountain riding to keep the chain aligned on rough descents. 2) Enduro or trail riding with 30-38T oval or 30-40T round chainrings for reliable performance. 3) Bikepacking or long day rides where secure chain retention reduces maintenance risk.