There are a few different types of bottom bracket mounting holes - ISCG 03, ISCG 05.
Aluminum Alloy Chain Guard, Durable ISCG 05/03 22T-46T Chainrings Frame Protector, Prevent Chain Drop, Lightweight for Mountain Bike Riders, Road Bikers, and Urban Cyclists
Chain Guide for Off-Road Bicycles with For BSA External Threaded Bottom Bracket and ISCG-03 ISCG-05 Mounting Options (Red)
FNFTOEZGY Compatible for TOSEEK MTB Chain Guide Guard, Ultralight Single Disc Sprocket, 32T-38T Fit ISCG-03/ISCG-05/127(Black)
Xiuganpo Aluminum Alloy Bash Guard Lightweight Chain Guard for 22T-46T Mountain Bike ISCG 05 ISCG 03 Mount (Ti Color)
Cryfokt Aluminum Alloy Bash Guard Lightweight Chain Guard for 22T-46T Mountain Bike ISCG 05 ISCG 03 Mount (Black)
Single Chainring Chain Guide for Off-Road Bikes with ISCG-03 and ISCG-05 Mounting Compatibility and Support for 30T to 40T Round Chainrings (ISCG05)
