Chenguang MECHANICAL PENCIL 0.5MM - 1pcs - No:AMPH5501Made in ChinaMade of high qualityInvisible rubber design, easy and convenient2. High-tech, precision rotating structure, and precise control of the single core length.Rotate clockwise to adjust the core lengthSingle core length 0.05mm-1mmRotate counterclockwise to lock the core.Family tree dense 4mm core-protected pipe prevents lead core breakage and is suitable for multiple requirements for precise drawing and writing.SLEEVE LENGTH ADJUSTMENT MECHANISM. TWIST THE GRIP TO THE RIGHT TO EXTEND THE SLEEVE & TO THE LEFT TO RETRACT IT. THE SLEEVE LENGTH CAN BE ADJUSTED FROM 0MM TO 4MM.LEAD FEED ADJUSTMENT RING. THE LENGTH OF THE LEAD FEED CAN BE ADJUSTED FROM 0.2MM ΤΟ 2.0MMREMOVABLE POCKET CLIP. IF YOU DON'T LIKE THE CLIP UNSCREW THE RING ABOVE IT & REMOVE IT.ADJUSTABLE LEAD GRADE INDICATOR. LOOSEN THE RING AT THE TOP OF THE PUSH BUTTON TO SET THE LEAD GRADE FROM 4H TO B.