Specially shaped brush and bristles fit inside semi-auto magazines and mag wells to get the very last speck of dirt hiding in the corners. With the magazine really clean, you can find defects and prevent malfunction. Mfg: Kleen Bore SPECS: Nylon bristles, twisted steel handle with loop. 7¼ (18cm) long. M 200 - fits .22, .25, .380, 9mm single-stack mags. M 202 - fits 9mm/.45 double-stack mags. M 204 - fits .45, .40, 10mm, .38S single-stack mags,M 206 - fits AR-15/M16, AK47/MAK-90.