Industry standard 5/8 in x11 mounting threads. Use as a lightweight, yet sturdy, base for your laser level. Hollow for optical and laser plummet instruments, flat head design makes setup fast, plumb bob hook, Quick cl-Amp, and hinge stops. Electrostaticallypowder painted castings for a durable and long-lasting finish. Extension legs adjust quickly and securely, 63 in H open, 38 in H closed. Heavy-duty poly-webbing shoulder strap.