Model 925 is required for cats, rabbits, pigeons, monkeys and other large animals. It allows the 900 series frame to be raised, lowered and rotated 360°. Vertical Post 1” dia. And is 10” in length, the bottom of shaft is machined to ¾” diameter for compatibility with Model 1210 and 1211. Model 1210 Base Plate (Table Mount) 4¾” x 3¾”, includes mounting plug, screw, tee handle, washer, post and Allen wrench is included. Model 1725 Universal Clamp and Stand Post is compatible for use with 1711 and 1712 Base Plates.