Screw

A screw is an externally helical threaded fastener capable of being tightened or released by a twisting force (torque) to the head. The most common use of screws is to hold objects together and there are many forms for a variety of materials. Screws might be inserted into holes in assembled parts or a screw may form its own thread.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

FRAMEMOUNT

Hang art and photos like a gallery — free calculators for picture-hanging height, gallery-wall spacing and layout, frame-and-mat sizing, hanging-hardware weight ratings, and salon-grid planning, plus plain-English guides to arranging and displaying wall art.

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