Skyjack Contact Block, N.O. (Normally Open) Fits Skyjack Scissor Lift Models SJIII 3215, SJIII 3219, SJIII 3220, SJIII 3226, SJIII 4620, SJIII 4626, and SJIII 4632. Fits Skyjack Rough Terrain Scissor Lift Models SJ7127 RT, SJ7135 RT, SJ8831 RT, SJ8841 RT, and SJ9250 RT.