Brass bevel gears ideal for transmitting power through 90°. Gears run only in pairs in the specified transmission ratio. * 15/30 tooth * 2:1 ratio * Grub screw fixing * Bores 4mm/5mm * Diameter 13mm/23.5mm * The larger of the 2 gears is secured to the shaft or axle by a grub screw (included) * Supplied in sets of 2