/ Precision Measuring Tools / Precision Hand Tools / Squares / Combination Square Accessories / PT99021 * Not actual product image PT99021 Lock Bolt Assembly For 4" Square & Center Heads 12141 Heads for Combination Squares, Combination Sets, and Bevel Protractors Lock Bolt Assembly for 4" Square & Center Heads Lock bolt Assembly. Specifications 3D CAD Files / Exploded Parts Diagram Product Testimonials California Prop 65 Other similar products PT99004 Lock Bolt Assembly For 6" Square & Center Heads PT99006 Lock Bolt Assembly For 12", 18" or 24" Square Head PT99021 Lock Bolt Assembly For 4" Square & Center Heads PT99155 Lock Bolt Assembly For 6 in Blade Center Heads Contact Starrett Specifications Made in America: Yes 3D CAD Files / Exploded Parts Diagram Login to see related product files. Or create an account. Product Testimonials Write a product review Write a product review Comments* First Name* Last Name* Email* Occupation The information you provide will be used in accordance with the terms of our privacy policy. I agree to the privacy policy. Please provide the required information. Thank you for submitting a product testimonial on www.starrett.com. By submitting information to Starrett, you acknowledge and give express permission for the L.S. Starrett Company to use and share your statements. California Proposition 65 Warning WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov