![Open Bulldog Clutch 9.3 x 4.5mm (9699853071)](http://perrinwatchparts.com/cdn/shop/products/83-18-30_f729f6b6-ee29-4bfd-8395-327f8f229a27_300x300.jpg?v=1595349965)
Open Bulldog Clutch 9.3 x 4.5mm clutches are most commonly used with scarf pins, lapel pins and tie tacks. Clutches have either a rubberized plug on the inside or are spring loaded to catch the pin. These clutches fit 0.36' to 0.42' (0.91mm to 1.06mm).