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The 5/16” x 8” in. Safe Bit features a special 7.9 mm Tungsten Carbide tip with a unique negative rake angle and a shortened chisel edge that increases it’s effectiveness and reduces tip failure. Each PRO-LOK® Butter Bit is diamond ground for razer sharpness to withstand the rigors and temperatures a locksmith may encounter when drilling hardplate for entry into a safe.
Manufacturer Resources
Product Specs
- Subcategory:
- Locksmith Tools
- Product Subgroup:
- Locksmith Tools
- Product Type:
- Safe Bits
- Product Category:
- Safe Bits
- Department:
- Door Hardware
Pro-Lok SB12 – Frequently Asked Questions
1) What kind of tip does the Pro-Lok safe bit have, and why does that matter on hardplate?
The tip is 7.9 mm tungsten carbide, ground with a negative rake angle and a shortened chisel edge. On hardplate that combination is what keeps the tip from chipping out: the negative rake supports the cutting edge against the shock of hard, abrasive material, and the shorter chisel edge cuts down the plowing force at the center. Pro-Lok diamond grinds each bit, so it goes in sharp rather than needing to be dressed first.
2) Is the 8 inch Pro-Lok safe bit long enough to reach the lock on a typical safe door?
Eight inches overall is the long option in Pro-Lok's safe bit line and is meant for drilling through a safe door where you have to get past the outer skin and hardplate before you reach the lock. On a thin-door gun safe or light commercial safe that is more length than you need, and a shorter bit in the same series will flex less. Match the length to how deep the door actually is.
3) Do I need to order anything else with the Pro-Lok SB12, or is it ready to drill?
The SB12 ships as a single bit, in one model only, already diamond ground sharp. What it does not include is the rig: you supply the drill, the mounting or magnetic base, and cutting fluid. Carbide on hardplate wants steady feed pressure and low RPM, so a variable speed drill matters more than raw power.
4) Can I resharpen a Pro-Lok safe bit after it dulls?
Tungsten carbide can be reground, but it takes a diamond wheel, not a standard bench grinder stone, and the negative rake geometry has to be reproduced or the bit loses the very thing that keeps it from failing on hardplate. Most locksmiths treat these as consumables and keep spares in the kit rather than trying to match a factory diamond grind in the shop.
How fast can I get the Pro-Lok SB12 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pro-Lok SB12 come with a warranty?
Absolutely. The Pro-Lok SB12 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pro-Lok SB12?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Pro-Lok SB12 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.