3M Dual Lock Velcro Specifications (Double Sided Scratch) The 3M Dual Lock fixing system is very popular in the motorsport industry. It is made up of two self-adhesive plastic strips with small mushroom-shaped claws which grip very easily and release without wear or tearing when pulled. Ideal for many applications we specifically recommend it for fixing temporary accessories on the dashboard or anywhere inside the car: gauges transponder shift light MyLaps communication etc. This 3M Dual Lock tape benefits from a high-strength fixing for a nested thickness of 6 mm; it is sold in rolls one inch wide (25.4 mm) and one meter long (for 50 cm of  fixing).