Strongbox hitchlock fits most ALKO, Steelpress and Knott pressed steel hitches. Applications for the Strongbox Hitchlock: ALKO AK270 & AK161, AK160A/B, AK300A, Steelpress ZSK-1300C/E/H/K, ZSK-1700B/C/D/E, ZSK-2000B/C, BC-3000.1A/B/C/D, Knott KK14-A/B/C, K20-A/B. Suitable for use with most braked and unbraked hitches on drawbars of up to 50mm. Note: Not suitable for raised hitches, hitches fitted with a skid or those with a delta mounting. Lightweight and user friendly touring or storage product. High security lock with anti-drill feature. Ideal for caravans and trailers with pressed steel couplings. Fits a straight drawbar rather than an A frame. Helps prevent parking theft when fitted hitched. Strongbox features an anti prising lip. Ideal for light trailers. Warning: Do not tow with hitchlock fitted. Lock: 7 pin RPT security with hardened anti-drill centre. Registered design no. 3018888. The box contains: Hitchlock body, Hitchlock front plate, Lock with three keys, Fitting instructions and warranty card.