The design consists of the features of shape, ornament, pattern and configuration of the entire Pain Brush Handle shown in the drawings.Drawing(s)/photograph(s) of the design is (are) included.The drawings shown one design having five variants which do not differ substantially from each other. Figures 1 through 4 show the first variant. Figures 5 through 8 show the second variant. Figures 9 through 12 show the third variant. Figures 13 through 16 show the fourth variant. Figures 17 through 20 show the fifth variant.Figure 1 is a top plan view of the pain brush handle showing the first variant of my new design.Figure 2 is a side elevational view of the paint brush handle showing the first variant of my new design.Figure 3 is a top front perspective view of the paint brush handle showing the first variant of my new design.Figure 4 is a rear bottom perspective view of the paint brush handle showing the first variant of my new design.Figure 5 is a top plan view of the paint brush handle showing the wider second variant of my new design.Figure 6 is a side elevational view of the paint brush handle showing the wider second variant of my new design.Figure 7 is a top front perspective view of the paint brush handle showing the wider second variant of my new design.Figure 8 is a rear bottom perspective view of the paint brush handle showing the wider second variant of my new design.Figure 9 is a top plan view of the paint brush handle showing the wider third variant of my new design.Figure 10 is a side elevational view of the paint brush handle showing the wider third variant of my new design.Figure 11 is a top front perspective view of the paint brush handle showing the wider third variant of my new design.Figure 12 is a rear bottom perspective view of the paint brush handle showing the wider third variant of my new design.Figure 13 is a top plan view of the paint brush handle showing the wider fourth variant of my new design.Figure 14 is a side elevational view of the paint brush handle showing the wider fourth variant of my new design.Figure 15 is a top front perspective view of the paint brush handle showing the wider fourth variant of my new design.Figure 16 is a rear bottom perspective view of the paint brush handle showing the wider fourth variant of my new design.Figure 17 is a top plan view of the paint brush handle showing the wider fifth variant of my new design.Figure 18 is a side elevational view of the paint brush handle showing the wider fifth variant of my new design.Figure 19 is a top front perspective view of the paint brush handle showing the wider fifth variant of my new design.Figure 20 is a rear bottom perspective view of the paint brush handle showing the wider fifth variant of my new design.