The OneUp ISCG05 Top Underbash is ideal if you're not looking for chain retention or your bike has an integrated chain guide. With the OneUp ISCG05 Top Underbash you can still add some bash protection. This underbash includes 3 different sizes of bash plate for compatibility with chainrings from 28-36T. Designed for frames with 2 ISCG05 tabs only (Evil, Rocky Mountain, etc). Should not be used on frames with 3 ISCG05 tabs. OneUp ISCG05 Top Underbash Features Install without removing your crank Single tool install and adjustment Boost compatible Oval Compatible Stainless Steel hardware Includes 3 bash plates (28-30T, 32-34T, 36T) OneUp ISCG05 Top Underbash Specifications Weight:  68g 32-34T Capacity: 28-36T Chainline: 2.5mm adjustment Mount: ISCG05 2-Bolt ONLY Color: Black Material: 7075 aluminum, glass reinforced thermoplastic