The ornamental design for a chalkholder, as shown and described.
1. Chalk holder
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Right
1.6 : Top
1.7 : Bottom
1.8 : Bottom perspective
The material is made of synthetic resin; this design item is used to adjust the length and fix the position by inserting the chalk; figure 1.1 is a diagram representing the overall shape of the design, figure 1.2 is a drawing showing the front side of the design, figure 1.3 is the back side of the design, figure 1.4 is the left side of the design, figure 1.5 is the right side of the design, figure 1.6 is the top side of the design, figure 1.7 is the bottom side of the design, figure 1.8 shows the overall shape of the bottom part of the design.