Center well: 18mm (3/4") I.D. Two Side wells: 16.5mm (5/8") I.D. Through holes-12.7mm (1/2") I.D. Includes 3 additional reducing bushings to hold smaller diameters. Includes with 5 nylon cable ties for attaching wires to Flexible Arm. Base and flexible arm (f18315-2322) sold separately

Attaches to the end of the Flexible Arm providing 3-stepped wells for securing an electrode, a reference electrode, and an ATC probe.