For use with buckle mounting holes.
How to use: Place the rubber board vertically on the bed leather, and hammer it with a mallet to drill holes.
The length of the hole can be adjusted by connecting and unscrewing.
Size: No. 5 (oval hole 0.6 x 0.1 inches (15 x 2.5 mm)
Caution: Care for Sharp
(From Amazon.co.jp)