SPI Square Inspection Block Spirit Levels

Features:

• With Stabilized Cast Iron Base
• 2 Sides with flat bearing surfaces and 2 sides with flat and Vee bearing surfaces.
• Heat insulating top plate with glass.
• Width: 19⁄16"
• Maximum clarity of bubbles.
• Cross and main vial easily adjustable.
• Hex key wrench for adjusting screws.
• Furnished in fitted case.
• SENSITIVITY PER 10"