The Salvimar Barb & Pin for 6.5mm Shaft with Settled Barbs have been designed to fit shafts with a diameter of 6.5mm. They have been designed for good penetration and smooth operation. In this package you will receive 1 Barbs and 1 Pin to fit the barbs to your spear shaft. Fitting barbs to your shaft is a simple process that you can easily do yourself.