If you have ever used a Pin Spanner you have probably had one slip out of the hole. This usually causes damage. RT Pin Spanners have a unique pin design with a reverse taper to keep them from popping out during use.
Each pin set is double sided. Note-the sizes listed are of the actual pin diameter. If they fit in the hole they can be used however we recommend using the largest pin size that fits in the hole to avoid breakage of the pins.