knurled portion

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Barbell — This article is about the exercise equipment. For the piece of body piercing jewelry, see Barbell (piercing). A man bench pressing 345lbs (156kg). A barbell is a piece of exercise equipment used in weight training, weightlifting and powerlifting … Wikipedia
Iron sight — Sight picture through iron sights of an H K MP5 submachine gun. The annular shroud around the front post sight is aligned with the rear peep sight to ensure the weapon is properly trained. Iron sights are a system of shaped alignment markers… … Wikipedia
Reed clipper — A reed clipper (also known as a reed trimmer) is a small tool used by clarinet or saxophone players to adjust the single reeds used on those instruments.The clipper is used to trim off a portion from the tip of the reed. This can make a soft reed … Wikipedia
industrial glass — Introduction solid material that is normally lustrous and transparent in appearance and that shows great durability under exposure to the natural elements. These three properties lustre, transparency, and durability make glass a favoured… … Universalium

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