COSMOS Pack of 12 PCS Screw In Archery Bullet Points for Arrows, 100 Grain Each
Brand: Cosmos
Color: Original version
Outside diameter is 8 mm ( 5/16 inches ) and screw diameter is 4 mm.
Weight: each piece about 6.5 g / 100 grain.
Great for practice and target use.
Easy to replace and operated.
12 pcs per pack