groove 22 extends all the way through from the top side 18 t of the leg section 18 to the bottom side 18 b of the leg section 18 for a longitudinal distance of approximately u215e inch from the free end 18 f of leg section 18 the same groove 22 extends partially through from the top side 18 t of the leg section 18 down to approximately midway of the arcuate opening 20 and ends at the circumference of the arcuate opening 20 the bottom of this part of the groove 22 coincides with the bottom of groove 21 in the first leg section 17 the two front flat inner surfaces 18 g of leg section 18 may have non skid material e g rubber attached thereto in order to prevent the string line tool 1 from slipping off the construction piece to which it is to be attached when applied for a particular construction project the non skid material may be attached to the surfaces 18 g either as flat pieces by an adhesive means for example or as solid elements imbedded therein the string line tool 1 of this invention may be made from plastic metal or wood plastic is preferred for example avs plastic the manufacture of the string line tool 1 of this invention is done by injection molding both the support member 2 and the line block 3 are joined together as a single unit by injection molding and the handle 4 is also made by injection molding alternatively the support member 2 and the line block 3 may be made separately by injection molding and then attached to each other by some appropriate fastening means e g screw s adhesive fusion etc an example of an application.