M1E4.5, Min Diam Retainer Extension, 5/16 Stud, 4.5-6.6"L

Min Diam Retainer Extension, 5/16 Stud, 4.5-6.6" Length For 38mm & 54mm Minimum Diameter Retainers Allows Use Of Shorter Length Motors Adjustable Length From 3.0-4.5 Inches Precision Machined 6061-T6 Aluminum With Mil-Spec Type II Red Anodizing 5/16-18 Stainless Steel Stud & 2 Stainless Steel Jam Nuts Attaches To Motors Forward Closure Just Slide Motor In And Screw Extension Onto Retainers Stud Mount, That`s It! (Aeropack)