Accessories:Shock Mount-4PCSStainless Steel Flat Head Screw 3x10-8PCSStaninless Steel Round Head Screw 3x18-4PCSStaninless Steel Round Head Screw 3x20-4PCSAluminum Collar 3x6x1-4PCSAluminum Collar 3x6x2-4PCSProduct major functions & usage:Stabilize and adjust shockMajor advantages of upgrading to this part/product :1. Aluminum 6061 T6 is light material with high tensile strength for great durability during extreme RC action.2. Multiple positioning holes to adjust angle of damper to suit different driving condition.