The Equetech Jet Magnetic Stock Pin is a particularly eye-catching riding stock pin with a large central pitch black stone. This simple but smart Equetech Jet Magnetic Stock Pin fastens using strong magnets instead of a pin to avoid snagging delicate fabrics. This piece is 15mm in diameter. Note: People who have a cardiac device such as a pace-maker should not use the Equetech Jet Magnetic Stock Pin because the magnetism may interfere with the operation of the device.