StewMac Endpin Jack Wrench – 8" Hollow-Shaft 9/16" Deep Socket Nut Driver for Acoustic Guitar Endpin Jack Installation Through Soundhole
24" Adjustable Scaffolding Leaveling Jack, Galvanized Steel Hollow Screw Jack with Base Plate, 4 Pack
Newhai Hydraulic Hollow Jack 30 ton Hollow Hydraulic Ram with 2 inch Stroke Automatic Retraction Hydraulic Cylinder for Lifting Tensioning Construction Industrial Applications (30 ton; 2 inch Stroke)
Zonon 4 Pack 24inch Adjustable Leveling Jacks Scaffolding Hollow Screw Jacks with Base Plate for Baker Style Scaffolding Baker Scaffold
Bonvoisin Hydraulic Hollow Jack Cylinder 30T Hydraulic Ram Cylinder 2" Stroke Porta Power Ram Single Acting Lifting Cylinders for Machinery Shipbuilding
Hollow Jack
HYADSHEN 20T 2” Stroke Hydraulic Hollow Cylinder Jack Porta Power Ram Jack Hydraulic Lifting Cylinder Industrial Hollow Hydraulic Cylinder Jack for Machinery and Shipbuilding
LFGUD 60T Hydraulic Cylinder Jack, 2" Stroke Hollow Single Acting Hydraulic Ram Lifting Cylinder RCH-6050 Automatically Porta Power Jack for Shipbuilding, Machinery, Construction