Thru Hull The original Thru-Hull with the worlds smallest hole cut-out for a thru hull light at only 1\"! This light with a 30mm profile head makes it ideal for Transom mount applications. A very quick to fit and effective underwater light. Suitable for Fiberglass, GRP and wooden hulls and now also available for use on aluminum/steel hulls using the delrin sleeve. Lloyds Type Approved, RINA, ABS Type Approved, USCG Ignition Protected and ABYC H-27 Side Load approved. All lights utilize Tritonium Optical lenses, and are supplied with a quick connect system by Deutsch ensuring almost \'fool proof\' installation and compliance with ABYC, E11 regulations. 12000 - Total LUX Level @ 1 meter/ 39 3/8\" « less