Frequently Asked Questions

Q: Can I return a countersink if it doesn't work well?

Unused products in resalable condition can be returned or exchanged within 7 days without reason. If quality issues are confirmed after use (wrong angle, excessive runout, material mismatch), we replace or refund free of charge. Lihao Technology offers an 18-month warranty and ten-times refund for counterfeits.

Q: What if I find a quality issue halfway through use?

Contact customer service with photos or a sample. Once confirmed, we will ship a free replacement or issue a pro-rated refund. Lihao Technology takes product quality seriously and never evades responsibility.

Q: Is technical support available? Who solves machining problems?

Yes, free technical support. Lihao Technology has a professional technical team for selection help, parameter setup, troubleshooting and programming guidance. Support via phone, WeChat and video with 48-hour response; engineers are assigned for complex issues.

Q: What if tool life doesn't match the claims?

Our advertised tool life data is based on standard test conditions. If life is clearly short under normal use, contact us to analyze the cause - it may be a parameter or usage issue that our technical team can help optimize. If it is a genuine quality problem, we handle returns or exchanges.

Q: What if there is a quality problem with my countersink?

Lihao Technology offers an 18-month warranty with free returns or exchanges for quality issues. Contact customer service with photos or a sample; once confirmed, we ship replacements or refund free of charge. We promise ten-times refund for counterfeits and guarantee materials.

Q: Can I return an incorrectly ordered size?

Unused products in resalable condition can be returned or exchanged within 7 days. Custom products cannot be returned unless defective. Lihao Technology's customer service can help with selection to avoid wrong orders.

Q: Do you provide technical support?

Yes, free technical support. Lihao Technology has a professional technical team for selection help, parameter setup and troubleshooting. 48-hour response; engineers are assigned for complex issues.

Q: Can you provide samples for testing?

Yes. New customers can apply for free samples (standard sizes only) to test before bulk ordering. Lihao Technology is confident in its quality and welcomes comparison tests.

Q: Difference between 45-degree and 60-degree countersinks?

A 45-degree countersink creates a 45-degree chamfer - the most versatile angle for deburring and general chamfering. A 60-degree countersink creates a 60-degree cone mainly for countersunk screw holes, letting screw heads sit flush. Choose per your design drawings.

Q: Where is a 90-degree countersink mainly used?

Mainly for spot facing, large chamfers and applications requiring a 90-degree cone. It also handles hole edge chamfering and deburring in a single pass. Lihao Technology's 90-degree series covers a full range of sizes.