Aluminum Alloy ;Pen-style tool kit with bright COB light; 4-piece pen-style tool kit with internal magnet that holds pieces in place; Includes one each: PH0 Phillips head bit, PH1 Phillips head bit, SL3 flat slotted bit, and SL15 flat slotted bit; Bits are all made of Carbon Steel; Unscrew top (as marked by arrow) to reveal bit storage compartment; COB is 85 Lumens; Uses 3 button cell batteries (type LR44), included and replaceable; Note: Item ships with battery blocker; must be removed prior to use; Patent pending; Product Size: 4.375" l x 0.5" dia.;