Other Deals That Might Interest You


Locksmith Services from M&D Locks And Keys (50% Off). Two Options Available.

M&D Locks And Keys

from $20
Sorry, this deal is
Not yet...
See similar deals
Value Discount You Save
$40 50% $20
Give as a Gift
2 bought
Only 21 left

In a Nutshell

Locksmiths available 24/7 change locks, duplicate keys, and rekey doors, among other services

The Fine Print

Expires 90 days after purchase. Limit 1 per person. Valid only for option purchased. Limit 1 per visit. Must use the promotional value in one visit. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

Choose Between Two Options

  • $20 for $40 worth of locksmith services
  • $40 for $80 worth of locksmith services

Pin-and-Tumbler Locks: Lining Up for Entry

The seemingly random ridges on your keys are actually a code that tells a lock how to open. Read on to learn more about how a common type of lock lets you in—and keeps burglars out.

Since its invention in the 19th century, the average pin-and-tumbler door lock has remained remarkably trustworthy: put the right key in and the lock grants you entry. Put the wrong key in and no dice—like clockwork, every time. The lock works through a feat of simple mechanical engineering. Inside the lock is a cylinder that rotates to move the deadbolt in and out. The purpose of a lock is to keep that cylinder from turning when it isn't supposed to—an obstacle it achieves via five or six spring-loaded pins that block the cylinder's rotation. At rest, with no key in the lock, the pins cascade into the keyhole at varying lengths. The length of these pins correspond precisely to a key's serrated ridges, which, when inserted into the keyhole, align the pins so that they form a single, seamless gap known as the shear line. Only then will the cylinder be able to rotate and disengage the lock. With the wrong key, the pin heights won't align correctly, preventing the cylinder from turning and keeping intruders from watching your parents’ cable while they’re out of town.

Of course, the pin-and-tumbler mechanism is just one of many varieties of locks, and in fact its design wasn't even particularly groundbreaking. The inventor, Linus Yale, drew inspiration from a large wooden version used in ancient Egypt some 4,000 years prior.

  1. 1

    M&D Locks And Keys

    140 Empire Boulevard

    Brooklyn, NY 11225

    Get Directions

Advertisement
Do it yourself, from home repairs to renovation projects
By purchasing this deal you'll unlock points which can be spent on discounts and rewards. Every 5,000 points can be redeemed for $5 Off your next purchase.