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Parts of a Mechanical Pencil

            
            
            
            
             • Lead rod outlet: the opening to mechanically eject the erasable lead rods through.0781 inches in diameter depending on the thickness of the lead rods the pencil is designed for.
            
             • Cone cap: made of either stainless steel or chrome-covered plastic. The cap protects the lead rod from breaking.
            
             • Rubber gripping barrel: a mechanism that wraps around the middle of the pencil where users would place their thumbs, index fingers, and middle fingers to hold the pencil while writing. There are some mechanical pencils without the gripper, depending on the manufacturer and for the purpose of the design. There are some with a ribbed wrapping to enhance the gripping feel. The smooth black rubber design is to provide an ergonomically comfortable gripping for long usage. The estimated measurements of the gripper are 1.75 inches in length and 0.5 inches in diameter.
             2. The Barrel Assembly.
            
             • Hourglass barrel: the main body of the mechanical pencil. Depending on the manufacturer, the barrel is made of either hard plastic or metal and its hollow body houses the lead rods. The hourglass design helps users in balancing the pencil while writing or drawing. The barrel usually measures approximately 1.75 inches in length and from 0.5 inches to 0.375 inches in diameter. .
            
             • Pocket clamp holder: designed to help carrying a pencil in the users' breast pocket. The clamp holder is also made of either stainless steel or chrome-covered plastic. The top of the clamp holder wraps around the hourglass barrel while the flexible bottom holds the pencil in place in the breast pocket. The clamp holder is 1.75 inches long and it is 0.5 inches in diameter. .
            
             • Lead rod ejector: holds the removable eraser and it is attached to the hourglass barrel. The ejector's hollow body is made of hard plastic; after removing the eraser, the lead rods can be refilled through the exposed hole.


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