Features The open end of Sidchrome spanners up to 32mm or 1 1/4" feature the revolutionary and unique "AntiSlip Design" - or ASD. ASD features a locking groove and unique geometry, to deliver 400% more surface area than a conventional spanner. This delivers greater torque to the fastener, significantly reduces the chance of dangerous slipping and allows the job to be completed faster. Sidchrome spanners are manufactured to meet or exceed relevant ASME and DIN international quality standards. You can be sure Sidchrome spanners are tough enough to stand up to the harshest working environment.