I bought cleat wedges to fit under my cleats. As a result I required longer bolts. Despite the wedges being sold with a very well known brand name the bolts supplied were nothing like those supplied by Shimano and gave little confidence in their ability to give a secure and long lasting fit... Therefore I searched for longer cleat bolts supplied by Shimano as the heads are much larger and the hex head had a much more secure fit for fitting/tightening... I am very pleased with the cleat bolts that I purchased. Exactly like those supplied with the SPD-SL cleats just that little bit longer (3mm) to allow you to fit wedges... Worth mentioning that the service I received from BIKETART was nothing short of exceptional!