Stinger Material Bucket 72" Series 4 Material Bucket. The Series 4 comes standard with a 1/4" Grade 50 Shell. This material bucket attachment comes standard with a universal skid steer mount plate. Our top channel brace and bottom radius support add the strength needed to handle the biggest machines. The bottom-radius support also adds better clean out. Bolt on Edge. Welded a 1/2 x 6 edge with holes to bucket shell, then bolt on a 3/4 x 6 edge to the bottom.