Getaprop prop protector http://www.getaprop.com/ Sat, 4 Feb 2012 14:17:43 -0600 en Clamp on Type... 4.13" Blade Dia, 1 3/4"-2" shafts... Supplied as an assembly that is split into two halves along the longitudinal axis so that it can be installed on the shaft without removing the propeller. The width is 0.67" (17mm). A gap of 0.9" (23mm) is sufficient; this includes 1/4" (6mm) of space for water to circulate to the shaft bearing. It is clamped onto the shaft by two Allen screws and is also fixed by a set screw that locates into a small drill dimple made in the shaft. Blade Diameter:4.13" Unit Width:0.67" Min. Gap:0.9" http://www.getaprop.com/content-product_info/product_id-6936/prop_protector_4_13.html http://www.getaprop.com/images/products/no1[1][2][2].jpg http://www.getaprop.com/content-product_info/product_id-6936/prop_protector_4_13.html