Disc detainer locks — the mechanism inside Abloy, ABUS Granit and most quality bike and motorbike locks — use rotating discs instead of pins. They need a dedicated disc detainer pick with built-in tension. This page has the picks and the clear practice locks to learn them.
Guide
Disc Detainer Locks & Picks
Instead of a stack of pins, a disc detainer lock has a row of rotating discs, each with a gate cut into its edge. The key rotates every disc to the right angle so the gates line up; a sidebar then drops into the gates and the plug turns. No springs, no shear line — which is why they resist raking and bumping, and why they need a different tool.
A disc detainer pick is two tools in one: an outer tension sleeve that grips the front disc and applies rotation, and an inner pick blade that turns each disc individually. You rotate discs one at a time, feeling for the one that binds against the sidebar — the same binding-order logic as pin tumblers, applied to rotation. We stock beginner-friendly picks with adjustable tension and the tip sizes for common European locks.
See the discs rotate, see the gates align and the sidebar drop. The best way to understand the mechanism in five minutes. Also listed under transparent padlocks.
A real lock with a window into the disc pack. Real tolerances, visible feedback. Also under cutaway locks.
Budget disc locks with loose tolerances for first opens, then tighter locks as you progress.
Disc detainer is a separate skill tree. You do not need to master pin tumblers first, but the belt ranking places quality disc locks around blue to purple belt because the feedback is subtle. A clear disc lock plus a decent pick is enough to begin.
Disc detainer picks are legal to own for hobby use in nearly all of Europe (legality by country). Do not attempt your own bike lock unless you are prepared to break it — practise on the locks here. For fundamentals like tension and binding order that carry over to disc locks, read how to pick a lock for beginners.
