Evolution Bike Co's V-brake adapter mount clamps allow you to mount V-brakes on frames that do not have V-brake mounts. Color: BLACK ANODIZED Made of aluminum alloy in the USA. USA made does not mean a product is perfect.  Posts are removable steel. Clamps to frame seat stays. This is a universal product and will not fit all frames. Evolution Bike Co developed these over many years and this is the design that fits the most bikes while also performing well. These will fit oblong seatstays that are 19mm to about 25mm WIDE (because of the clamping range), but no TALLER than 20mm. LOOK AT THE CLAMP. IMAGINE HOW THEY WOULD HAVE TO ATTACH TO MOUNT A BRAKE. THINK ABOUT "WIDTH" and "HEIGHT" in terms of how they clamp to your seat stays.  PLEASE READ THAT LAST SENTENCE AGAIN. SAVOR EACH WORD. Stated again, if your seat stay tubing is ROUND, the MAXIMUM DIAMETER your frame can be is 20mm. If your tubing is round (not oblong) and the diameter is larger than 20mm, these will not fit. Again, please read the last few sentences. Be sure you understand them. Ask questions BEFORE ORDERING if necessary. We will assist in any way that we can, but ultimately you will have to measure your frame seat stays. You can shim with plastic if your stays are smaller than this. Sorry, but we do not provide or sell shims. MEASURE CAREFULLY BEFORE ORDERING - WE WILL UNDER NO CIRCUMSTANCES ACCEPT A RETURN ON THIS ITEM. Can be used on aluminum or chromoly frames. To avoid frame damage, do NOT overtighten. SOLD IN PAIRS (1 pair = 1 set = for one frame) These are to mount a REAR V-brake. These cannot be used for FRONT brakes.