ITEM NAME:3/4'' & 1/2'' 13mmx19mm Chain Saw Bar T-Wrench Spanner Tool for Chainsaw MO.Wrench Shape: combination wrench. 1X chain saw wrench. Screwdriver head: "一" type. Dismantle most brush cutters and saws spark plugs. Sleeve: Wall thickness1.2mm. Head 13mm Length: approx. Model: 13 19mm.