Line baking sheet with waxed paper; set aside. Place "M&M's"® Chocolate Mini Baking Bits in shallow dish; set aside. In top of double boiler over hot water melt 3 squares semi-sweet chocolate. Remove from heat. Dip 6 pretzel rods into chocolate, spooning chocolate to coat about 3/4 of each pretzel. Press into and sprinkle with "M&M's"® Chocolate Mini Baking Bits; place on prepared baking sheet. Refrigerate until chocolate is firm. In top of double boiler over hot water melt 3 squares white chocolate. Remove from heat. Dip remaining 6 pretzel rods into chocolate, spooning chocolate to coat about 3/4 of each pretzel. Press into and sprinkle with "M&M's"® Chocolate Mini Baking Bits; place on prepared baking sheet. Refrigerate until chocolate is firm. Place remaining 1 square semi-sweet chocolate in small microwave-safe bowl; place remaining 1 square white chocolate in separate small microwave-safe bowl. Microwave at HIGH 30 seconds; stir. Repeat as necessary until chocolates are completely melted, stirring at 10-second intervals. Drizzle white chocolate over semi-sweet chocolate-dipped pretzels; drizzle semi-sweet chocolate over white chocolate-dipped pretzels. Sprinkle pretzels with any remaining "M&M's"® Chocolate Mini Baking Bits. Refrigerate 10 minutes or until firm. Store tightly covered at room temperature.