Some jack screws are adjustable and are used to level, move and position machining equipment such as drill presses, milling machines, grinders, CNC machines, planers , shapers, tables, fixtures and more. Available in 4 adjustable sizes, each jack can be adjusted finely and quickly via a fine adjusting screw. These adjustable jack screws feature a height locking ring and can hold up to 2,000 pounds. Other jackscrews are used in electronic devices to form a secure contact between electrical device and cable, such as between televisions, DVD players, and laptops, etc. For more items that address spacing, see our round standoffs, hex standoffs, square standoffs.