is useful for gauging the appropriate seam allowance likewise the second limb 14 has a width of 1 8 34 from the center needle position 15 to the side edge of the second limb 14 so that this narrow limb 16 clears the previous seam allowance makes 34 easing 34 easier prevents 34 tucks 34 and provides for better control even in curved seams as can be appreciated to those skilled in the art the limbs 14 and 16 can be of any predetermined widths depending on the stitching application and the system of measurement e g english or metric systems as used throughout the specification and claims the clause 34 essentially about 34 concerning the dimension of limbs 14 and 16 is intended to cover the measurement from the needle position to the edges of the limbs 14 and 16 in the preferred embodiment grooves or indentations 20 are regularly spaced longitudinally along outer side or surface 22 of the first limb 16 and top surfaces 30 and 32 of the first limb 16 and second limb 14 however those skilled in the art will recognize that the indentations need only be on one surface or may be present on additional surfaces to those shown in the drawings such as the inside surfaces of the limbs or on the outer surface of limb 14 similarly the indentations.