Stay in compliance with 49 CFR Part 172.325 when you use Labelmaster’s Hot Flip Placard Systems. You can use markings printed with HOT and/or 3257 to satisfy both the 4-digit number and HOT marking requirements of 49 CFR, Part 172.325(c) and 172.336(b). Our heavy-duty Spacemaster frame is constructed of corrosion-resistant, fully formed aluminum alloy, with four double-riveted, stainless steel fasteners to hold panels securely in place. Ship safely when you opt for these tried and tested DOT placard systems.