These mount posts are used to install a brushless motor in front of the firewall in order to adapt it to the length of the fairing. Choose the size you need. The four posts are used to mount the Dualsky XM42xx motors and larger.The length of the posts is adjustable in the range of 22.5-30 mm. The screws have an M4 thread. The weight of the assembly (4 pieces) is approximately 53 grams.