This listing is for a pack of four top quality, industrial grade polyamide plastic hinges with stainless steel pins and concealed fixings. Ideal for use outside, when corrosion can be an issue for metal hinges. As fitted as an OEM part by many truck/trailer manufacturers but also popular as a high quality alternative on motorhomes, caravans etc... Designed to be surface mounted. Four M5 inserts on the back allow the hinge to be bolted on from behind. Concealed fixings are more secure and nicer aesthetically. 180 Degree Opening. Made from a strong, reinforced polyamide plastic. Multiple fingers for strength. Made in Italy. 48mm Tall and 49mm Wide.