Lock Washer, Lock Washer Type Internal Tooth Lock, Finish Plain, Material Stainless Steel, For Screw Size M5, Inside Diameter 5.3 mm, Outside Diameter 10 mm, Maximum Thickness 0.6 mm, Dimensional Standards DIN 6797, Material Grade/Class 18-8, Pack Size Small Pack, System of Measurement Metric, Package Quantity 50 Open Perimeter Internal Tooth Metric Lock Washers create an interference lock to help prevent loosening. An excellent choice for use with small-head screws and fasteners, and for applications where a clean appearance is desired.