Punch, recommended eyelet opening, and hammer set
This set includes a jumper dot that is necessary for hitting metal fittings, a grommet opening that creates round holes for mounting gaps and hardware, and a "hitting pedestal used for installation.
How to Use:
Hammer the metal fittings set in the leather and hammer several times
(Set Contents) Set Includes: Jumper Dot Hammer (Medium) *Compatible Hardware: Medium 0.5 inch (13 mm) No.1064, Eyelet Opening No. 10, Φ3.0 mm), Hammer
(From Amazon.co.jp)