Safety Stop - EVB094 Safety stop for use with stands S241/S242To stop head tilt slide safety stop into gap behind pivot arm. Related articles x0.45 Objective Lens - OBL001 SX Double Arm Boom with Base - S242 SX Double Arm Boom with Clamp - S241 x1.0 Objective Lens - OBL003 Base only for Multi-Axis Stand - EVB022