The Fastronix 1/2" flexible terminal covers are designed to cover the stud and nut of 1/2" studs. The back of the cover features a tapered end with a 0.55" opening that can be cut to accept wire diameters up to 0.75". The durable material used in the covers make it a great product to protect your studs from dirt, oil, and grease ensuring a reliable connection for years to come.