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Medium strength brass padlock with chrome finish - Grade 3 - PL330 padlocks feature an 5/16" diameter hardened boron steel shackle.
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Tough, surface hardened steel padlock - Grade 4 - PL340 padlocks are equipped with a 3/8" diameter, hardened boron steel shackle.
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Tough brass padlock with chrome finish - Grade 3 - PL341 padlocks feature a 3/8" diameter, case hardened boron steel shackle.
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Strong, case hardened steel padlock with protected shackle - Grade 4 - PL342 padlocks are equipped with a 3/8" diameter, case hardened boron steel shackle.
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Extra strong steel padlock for demanding applications - Grade 5 - PL350 padlocks are equipped with a 9/16" diameter, case hardened boron steel shackle.
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Strongest padlock in the market - Grade 6 - PL362 padlock is equipped with a 9/16 diameter, case hardened boron steel shackle. For applications where maximum security is required.