Techne Dri-Block® Aluminum Heating Block Insert, 20 x 13 mm Diameter: Amazon.com: Industrial & Scientific
Amazon.com: Mnwan 15Pcs Setup Block Height Gauge Set,Precision Aluminum Setup Accessories,Set Up Block for Woodworking : Tools & Home Improvement
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Cole-Parmer Aluminum Block, for 30 x 1.5 mL Microcentrifuge Tubes: Amazon.com: Industrial & Scientific