These scratch in waiting boot studies are made from 304 stainless steel and are designed to provide a secure and related grip on slip per surfaces The set includes 26 studies Length in 8mm, Nut 3.5mm sizes, as well as a standard screendriver with a plastic case for easy storage and portability The screw in design allows for easy installation and removal, preventing you from slipping off in wet or muddy conditions With a durable construction, Will not rust, it is also suitable for your other shoes that require screws to prevent slipping.