CM530 - Combination pintle hook receiver arm Couplemate's combination pintle hook is a one-piece 50mm receiver arm. There are real savings to a one-piece towing system that fits into a 50mm towbar mount. Please note the NHVR states that 50mm tow balls must be de-rated for tow vehicles over 5t. Refer to Vehicle Standards guide VSG-16 for de-rating. Important towing safety information: Up to 3.5t towing capacity when used with a 50mm trailer coupling. When towing or pulling with the ring hook part, the rating is 6-tonne. Always check that the trailer is level with the tow vehicle. If the trailer is NOT level with the tow vehicle, you will need a two price setup to lower or raise your hook. The distance from the back of the bar to the pintle hook shoulder is 195mm. 65mm from the end of the bar to the centre of the 5/8" hole. We recommend the use of a high tensile hitch pin for equipment over 3.5t. Remember to take care when reversing. Angles greater than 80 degrees will cause the trailer and coupling to jackknife. There are many truck and trailer merchants around asking, how on earth did you damage your pintle hook? Well, I installed the pintle hook and ring coupling equipment as you said and within one month this equipment is ruined and likely to cause an accident. Unless you really know your trailer there are various answers, all of which are pointing towards the customer. The most likely cause of equipment malfunction is a jackknife. Question: Is your 50mm tow hitch rattling? Answer: The solution is a high tensile pin. Weight:8 kg Dimensions:50 × 25 × 5 cm