Standard 3/8" x 24 threaded base Hole diameter of 0.200" used for 48-102" whips Set screws to make sure your antenna is safe and secure 1 3/4 long with threads Needs a 3/32 allen wrench (NOT INCLUDED) Pro Trucker Super Duty Weatherproof CB/Ham Radio Antenna Stud Mount - Stainless Steel Pro Trucker super duty and weather proof CB/Ham radio antenna stud that is guaranteed not to rust out! This antenna stud comes with two set screws to ensure your 48-102" CB antenna whip stays where it's supposed to. With a heavy duty stainless steel construction, this antenna stud is a top choice for CB'ers looking for a new stud replacement. Needs a 3/32 allen wrench (NOT INCLUDED) Pro Trucker is known for their quality and highest standard CB radio products and accessories. Try this base today, and you'll be glad you did!