Use "arm rest" in a sentence

1. The rigid "arm rest" is 70 ± 1 mm high, 150 ± 1 mm wide and should be allowed to penetrate at least 60 mm into the abdomen.

L’accoudoir rigide a 70 ± 1 mm de haut, 150 ± 1 mm de large et il devrait pouvoir pénétrer d’au moins 60 mm dans l’abdomen.