1/16" x 2" x 4-1/4" Black Stack Shims. High-impact plastic stack shims are weather-proof and will not rot, rust, stain or leach. Stack Shims allow up to 5 Length adjustments and 16 Thickness adjustments. 16 Heat-sealed pieces make up each one inch stack. Simply snap off the amount of shims to get the thickness you need. Color:Black Length:4-1/4" Width:1-15/16" Thickness:1/16" Slot:5/8".