3m Dual Lock is designed to hold weights heavier than standard velcro. 3M Dual Lock comes in different variations & adhesives. Depending on what Dual Lock is selected, you may need two parts (male / female) or other Dual Locks such as the clear products - SJ3560 or SJ4570 (low profile) can stick to themselves meaning only 1 roll is required. We supply the 3M range of Fastening Systems in small quantities, which are the 3M Trial Bags. The 3M SJ3560 Clear Dual Lock we supply by the metre if you do not require a large quantitiy.