Grip › GRIP HEAD 2.5"- DOUBLE Image 1 of 1 GRIP HEAD 2.5"- DOUBLE $0.00 The 2.5" Double Grip Head is a combination of two joined 2.5" grip heads, mounted on a steel plate with a 3/8" (10mm) diameter rod. Add To Cart Added! The 2.5" Double Grip Head is a combination of two joined 2.5" grip heads, mounted on a steel plate with a 3/8" (10mm) diameter rod.