N-21 is included when buying a NM-11/21 . It is used when changing skate blades to remove tube rivets , to attach copper rivets and tube rivets . Copper rivets are removed by cutting them apart with cutting pliers
This hook together with tool set N-21 can be used on the belt buckles of ski boots for processing tube rivets . It can also be used together with tool 28 and tool 29 for larger rivets Uoint rivets with a size up to 025 mm) located on the sides of ski boots.
Tube rivets for attaching blades on skates. Available in lengths 8,10, 12, 14, 16, 18,20,22 and 24 mm . (0.32,0.40,0.48,0.55,0.63,0 . 71,0 . 79,0.87 and 0.95 inch.) Head is 1/4 inch diameter, Tube diameter 1/8 inch