Quick Installation & Space Saving: Easy to mount and remove, these bench positioners are user friendly and compact for efficient storage and offices organization Versatile Workbench Compatibility: Designed for 20mm openings, these positioners are suitable for various woodworking applications, from simple to moderately complex tasks Enhanced Grip Capacity: The anti twist rod design ensures secure handling with excellent gripping power through stable multi point fastener attachments Strong Aluminum Construction: Crafted from high strength aluminum alloy with steel fasteners, this positioning block set provides and consistent fixation for all your 3 / 4 inch woodworking projects materials Friendly Feature: Comes with removable silicone bumpers to scratches on your workpieces while offering a comfortable, ergonomic grip during extended use, Manufacturer: Kaeltsyn