100 Series: Brass Padlocks The 100 series padlocks are a closed shackle version of the popular 10 series brass padlocks. The hardened steel shackle is held in the locked position by a double ball locking mechanism. The lock is protected by a 5 or 6 pin key system with a key retention feature in the unlocked position. The shackle configuration prevents attack by conventional bolt cutters and, when used in conjunction with a security hasp & staple, provides good levels of security. 
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