Repeat purchase. Purchased for hanging Mitsubishi's ceiling ventilator body. It is not a large-scale thing like a hole in the building material, which tends to be on the battensheet, fixing it with M12 bolt, but it is possible to attach the battles themselves with square screws (TBA-65D accessories), and it is good to do work easily. Since the ceiling mounted type ventilator is about 5 kilometers even if it is heavy, there are things similar to excessive quality using two battles, but there is no choice because there are two mounting holes. The length of the bone plate is about 280 mm, the bolt part is 140 mm which is about half of it. The externally threaded portion consists of 3 types of nuts and 2 nuts of t1. Including the externally threaded part, if it makes the shank part longer by 20 ~ 30 mm, it is appreciated.