Review on 🔩 Truvativ Chainring Bolt Kit 5 Arm: Enhance Cycling Performance with Secure Fastening by Brian Mendoza

Of course you can buy a special tool to keep the slotted sprocket nuts from turning or you can be cheap like me and try to do it with a sawn off quarter side . The quarter fits perfectly but is difficult to hold in place even with locking pliers. These screws, secured on both sides with an Allen key, are a dream. I didn't pay attention, but in my opinion 7mm inside and 5mm outside. I love these nuts.