Motion Pro Tappet Adjuster (4mm Square with 10mm Socket) Motion Pro is dedicated to producing the most versatile, unique and durable products for professional and home use. Motion Pro tools are designed to be simple to use, yet durable enough to withstand the harshest conditions. One of their goals is to offer tools of convenience. Do it right the first time with Motion Pro Tools.Heat treated and chrome plated for durability.Kits include wrench with adjuster.Fits motorcycles and ATVs with screw-type adjusters.