Open Reel Audio Precision Aluminum Splicing Block for 1/4" Open Reel Tape with Surelok Center Groove by TME Full Size Professional 5-3/4" Long x 1 Inch wide x .25 Inches Thick CNC Computerized Precision Machining Hard Industrial Anodized Aluminum Alloy with Ultra Hard Protective Surface for a Lifetime of Use Scalloped Surelok center groove holds your tape in place Made in USA in an ISO 9001 Certified Machine Shop