WOODYS Trigger Snow Stud 1.630"The lake ice stud built to effortlessly penetrate icy terrain and provide ultimate traction with shortened threads and a lengthy, narrow, tapered profile. For use in two ply tracks and support plates Through hardened carbon steel with 60 carbide insert 15 16? head with anti rotation lines Proper nuts included with studs Woodys recommends snowmobile studs protrude 1 4? to 3 8? over the track lug.