What material are they made from? Do they cause any trouble once dried up in the floor?

These are made of a soft plastic material and do not cause any issue once dried up into the floor.

How far apart or how do you space leveling pins?

For easy pour materials set Level Pins 5 to 10 feet apart; for lower flow materials set Level Pins every 3 to 4 feet apart.

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Name: Bon Tool Level Pins - 50 piece Box
Brand: Bon Tool Co
SKU: 82-289
Price: 28.3 USD
Availability: InStock

$28³⁰ USD

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Brand: Bon Tool Co | SKU: 82-289 | MPN:

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Provides a visual guide to pour self-leveling materials or mortar to specific accurate depth
With use of self-leveling compounds and leveling pins, you achieve a level surface even when the substrate does not have a uniform, consistent height
High strength adhesive remains in place on the substrate
Flexible post will spring back in place if bent during pour
Has both standard and metric measurements
Inches from 3/16" to 2-1/2"
Millimeters from 5 mm to 65 mm

Determine high point in substrate and use as a reference height
Use a digital level or transit to determine pour heights at locations within your “level grid” set up on the substrate. For easy pour materials set Level Pins 5 to 10 feet apart; for lower flow materials set Level Pins every 3 to 4 feet apart
Snip each level pin to desired pour height
Peel the adhesive backing from the base of the pin and apply the pin to the substrate
Pour