SKB’s 3RR series removable shock rack transport cases that are available in 7 sizes, 3U, 4U, 5U, 7U, 9U, 11U and 14U. These new shock racks are lightweight, shockproof, watertight, dustproof, heat and chemical resistant, perfect for protecting and transporting your sensitive electronic equipment. Molded of LMDP Linear Medium Density Polyethylene plastic that meets or exceed MIL-STD 810G standards and includes 8 elastomeric shock absorbers which allows a standard payload range of 40 to 150 pounds. Optional extended payload range of 160 to 300 pounds can be accommodated as a special order option. The 3RR Series Removable Racks are 24" deep from rail to rail with a standard 19" rack width per ANSI/EIA-310-C specification and feature square-hole rack rails to accommodate either #10-32 US standard, or 6mm International standard cage nuts which are supplied with the cases.